Interaction of a dense fermion medium with a scalar-meson field

Meson masses in a dense nuclear medium

The masses of the scalar (σ) and vector (ω) mesons and their widths in nuclear matter are studied in detail using the quark-meson coupling (QMC) model. It is shown that above normal nuclear matter density the effects of σ-ω mixing and the decay of the σ into 2π change the scalar meson mass considerably, while the vector meson mass remains near its mean-field value. We compare the QMC results wi...

σ and ω meson propagation in a dense nuclear medium

Fermion Damping in a Fermion - Scalar Plasma

In this article we study the dynamics of fermions in a fermion-scalar plasma. We begin by obtaining the effective in-medium Dirac equation in real time which is fully renormalized and causal and leads to the initial value problem. For a heavy scalar we find the novel result that the decay of the scalar into fermion pairs in the medium leads to damping of the fermionic excitations and their in-m...

Photon Splitting and Photon-plasmon Interaction in a Dense Medium

The photon splitting is the process with minimal rank of nonlinearity in the electromagnetic interactions. This kind of reaction is to be realized in various astrophysical objects (white dwarves, neutron stars), the early Universe and in the heavy ion collision experiments. In all these cases Furry’s theorem is violated because of the presence of the environments such as external fields or dens...

Strange meson-baryon interaction in hot and dense medium: recent progress for a road to GSI/FAIR

We report recent results on the dynamics of strange hadrons in two-body reactions relevant for near-threshold production in heavy-ion collisions at GSI/FAIR and NICA-Dubna. In particular, K̄N scattering in hot and dense nuclear matter is studied within a chiral unitary framework in coupled channels, setting up the starting point for implementations in microscopic off-shell transport approaches. ...